import { v4 as uuidv4 } from 'uuid';
//要生成一个随机字符串，且每次执行不发生变化，游客身份持久储存
export const getUUID=()=>{
   let uuid_token=localStorage.getItem('UUIDTOKEN')
   if(!uuid_token){
       uuid_token= uuidv4();
       localStorage.setItem('UUIDTOKEN',uuid_token)
   }
   return uuid_token
}